full out board game with rolling dice and miniature figures you put together and paint yourself. but if you dont like that there is "space marine" a 40k first person shooter as well. but they just show a few of the factions that are in 40k.

the fps is really good, i enjoyed it. of course there are always things i think they could have improved on but other than that it was really well made.
the dawn of war series are a fun real time strategy as well
dawn of war 1 has more of a total war theme to it, with tons and tons of units on the field, it also has a bunch of DLCs which soulstorm has the most factions in it.
dawn of war 2 is based more around the individual squad, fewer, more elite units that are more customizable and level up.